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A Green Method to Determine VUV (185 nm) Fluence Rate Based on Hydrogen Peroxide Production in Aqueous Solution
Author(s) -
Yang Laxiang,
Li Mengkai,
Li Wentao,
Bolton James R.,
Qiang Zhimin
Publication year - 2018
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12913
Subject(s) - actinometer , chemistry , aqueous solution , hydrogen peroxide , quantum yield , fluence , production rate , analytical chemistry (journal) , ultraviolet , irradiation , kinetics , photochemistry , oxygen , fluorescence , materials science , chromatography , optoelectronics , optics , plasma , organic chemistry , industrial engineering , ion , physics , quantum mechanics , nuclear physics , engineering
A mini‐fluidic vacuum ultraviolet/ultraviolet (VUV/UV) photoreaction system (MVPS) was developed in our previous study. Based on the MVPS, a green method to determine VUV fluence rate has been developed using the production rate of H 2 O 2 when water is exposed to 185 nm VUV. The H 2 O 2 production followed pseudo‐zero‐order reaction kinetics well over the first 10 min of VUV/UV exposure. This new method was well calibrated with a standard cis ‐cyclooctene cis–trans photoisomerization actinometer as recommended by the International Union of Pure and Applied Chemistry. The apparent quantum yield for H 2 O 2 production by 185 nm VUV irradiation of water was determined to be 0.024 ± 0.002. As the solution pH increased from 5.0 to 8.0, the H 2 O 2 production rate decreased from 0.83 to 0.40 μ m min –1 . Dissolved oxygen had a negligible influence on the H 2 O 2 production. This study proposes a novel VUV fluence rate determination method with advantages of nontoxicity, low detection limits, low costs and convenience, and it can be used as a good alternative to traditional actinometers.